Question

Please help i am swamped.

Answer 1

`\sqrt{(S)/(4\pi ) } =r`

Explanation:

S = 4 pi r^2

Divide each side by 4 pi

S / (4 pi) = 4 pi r^2 / (4 pi)

S / (4 pi) = r^2

Take the square root of each side

sqrt(S / (4 pi)) =sqrt( r^2)

sqrt(S / (4 pi)) =r

`\sqrt{(S)/(4\pi ) } =r`